NEW MARIXE SriDER. 391 



1902.] 



decrease in size towards tlie proximal end of tlie mandible ; all 



the teeth evenly spaced. . ■, i • 



Leas 1 4 2, 3 in leno-th. 1st leg wath a superior basal spme 

 on femur, 'the remaimng segments unspined : 2nd leg with 

 superior basal and anterior apical femoral spme, three interior 

 apical protarsal spines (sometimes one median inferior protaiml 

 spine as well), and one inferior median tarsal spme : 3rd leg with 

 one superior basal and three apical spines on femur one superior, 

 two or one anterior and two or one posterior, and two inferior 

 apical spines on tibia ; one superior, two anterior, two posterior, 

 and five inferior, of which three are apical, on the protarsus and 

 six inferior spines on the tarsus : 4th leg with one superior basal 

 and one posterior apical spine on femur two or three posterior 

 three inferior spines, of which two are apical, on the tibia, and about 

 twelve spines on the protarsus somewhat irregularly arranged as 

 follows— two above, two behind, two in front, and three pairs 

 beneath ; the tarsus armed with about six spines : the protarsi of 

 the 2nd, 3rd, and 4th legs furnished beneath with a pad of 



greyish hairs. , i • j.i. 



Vulva (text-fig. 78, C) formed upon the same plan as m the 

 other species of ^he genus, the median excavation very shaUow, 

 the lateral teeth distinct and projecting inwards and downwards, 

 the posterior median angle forming a rounded, _ smooth, sub- 

 vertical prominence showing a shallow basal constriction 



Measurements in mm. -.—Total length 10, carapace 5 ; 1st leg 15, 



2nd leg 11, 3rd leg 13, 4th leg 9-5. . , „ ,^ ., r^ in 



Loci Zanzibar. " Under stones at low tide {Gyvil Crosslancl). 



In a young specimen (about 2 mm. in length) the eyes have 



the same arrangement as in the adults, but are relatively much 



larger and consequently closer together; the mandibles are less 



prominent, and armed below with one outer and four inner teeth ; 



the trochanter of the palp is small, not elongate; the max^dlary 



processes are parallel-sided, lightly convergent and obtusely 



rounded at the apex; and the labium is wider than long and 



almost semicircularly rounded marginally. . •, i „ 



In the spacing of its eyes and the spme-armature of its legs 



this species is allied to D. maxillosa, vorax, martenst, and marina, 



which constitute a group hitherto believed to be restricted m 



range to the coasts lying between Singapore and New Zealand. 



Of these four species, the only two known to me are D. martensi 



from Singapore and D. marina from New Zealand and Austra la. 



From both of these D. crosslandi difi-ers in the form of the_ vulva 



and the closer spacing of the eyes. It re^emUes D. manna i^ 



the size and spacing of the two teeth on the posterior or outei 



side of the faig-groove of the mandible; but .n D marma the 



first tooth of the inner row is separated by a relatively wider 



space from the second than is the case m D. crosslandi 



^Of the other two species, namely, D. vorax ivom Upolu and 



D. maxillosa from New Guinea, &c., I can only speak with 



